<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo1</title>
  <script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>

<div id="app">

</div>

<script>
  var app = new Vue({
    el: "#app"
  })
</script>
</body>
</html>
